Disassembly; Impeller Nut Installation Torque - ITT MARLOW Serie Manual De Instalación, Operación, Mantenimiento

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2. Before hydrotesting the pump all air must be

removed from the suction priming chamber. This is

done by:

(a) Removing ¼" pipe plug from check valve cover

plate (76).

(b) Installing a ¼" pet cock valve (not supplied by

ITT) in place of pipe plug.

pumped through ﬁ ller plug (98) provided on top

of casing. Do not close pet cock until all air is

out of casing (as shown by a solid stream of liquid

coming out of pet cock).

(d) Close pet cock, reinstall ﬁ ller plug. Unit is now

ready for hydrotest.

DISASSEMBLY

If you need to replace impeller, wear plate, shaft seal, front

oil lip seal, bearing or check valve, follow these steps:

1. Drain pump casing completely by removing drain

plug (2) from both suction and discharge chamber.

2. Drain seal cavity oil by removing drain plug (27)

from bearing housing.

NOTE: A mixture of oil and water does not neces-

sarily indicate a seal failure. Inspect seal for damage

and replace if needed.

3. Drain bearing cavity oil by removing drain plug (28).

NOTE: If oil is mixed with water, shaft seal and

front oil lip seal must be inspected for failure.

4. Remove bearing housing support (35) capscrews

from base.

5. Disconnect coupling or "V" belt.

6. Remove capscrews (102) which hold seal plate (10)

to casing (1).

7. Pull complete assembly including bearing housing

assembly, seal plate and impeller (91) from pump

casing.

8. Remove impeller nut (4) and impeller washer (5)

from the shaft (38). Pry out the impeller (91) using

wedges behind the impeller.

NOTE: Check impeller for any broken vanes or

wear. If it is necessary, replace it.

Refer to impeller-nut torque value before reinstalling

impeller nut.

9. Remove wear plate (89) by removing locknut (116)

through the clean-out cover (83) hole. Check wear

plate for wear. Replace if required.

10. Remove seal assembly (17) from seal well as follows:

(a) Remove spring and rotating element of the seal.

(b) Pry out the stationary element gently from the

seal cavity by using screw driver. OR if seal plate

is removed from the shaft, the stationary seal will

slide out off the shaft along with the seal plate.

Be careful not to damage stationary element by

letting it hit the shaft.

NOTE: Before reinstalling seal assembly, make sure

that the rubber o-ring and both mating silicon-car-

bide rings, rubber bellows and shaft surface under

seal are in good condition. Make sure to lubricate

with water before reinstalling. If necessary, replace

seal assembly.

11. Remove capscrews (33) to disassemble bearing

housing from seal plate.

NOTE: Check gasket (105). If worn, replace it.

12. Remove the shaft assembly with bearings and bearing

carrier out of the bearing housing (31).

13. Check both lip seals (42), replace if necessary.

14. Remove the snap ring (106) from the bearing carrier

(110) which will allow the bearing carrier (110) to

slide off the shaft (38), along with o-ring (109).

15. Remove snap ring (108) from the shaft (38).

16. Check the bearings. If they feel rough when turning

by hand, replace the bearings. Remove bearings (36

and 117) from the shaft (38) using a hydraulic press.

17. If your pump is supplied with a shaft sleeve (24), the

sleeve is locked in place with a roll pin (101) and an

o-ring (104) to prevent leakage under the sleeve or

shaft sleeve. To remove shaft sleeve, push the roll pin

into the shaft (shaft has a drilled through hole) and

pull the sleeve from the shaft along with the o-ring.

Push the roll pin out of the shaft. Pump with slotted

shaft sleeve, pull the sleeve along with o-ring from

the shaft. Replace shaft sleeve, o-ring and roll pin if

necessary.

Check o-ring and shaft sleeve. If damaged, replace as

necessary.

When reinstalling the sleeve onto the shaft, make

sure that the roll pin is installed ﬂ ush or maximum

.005" under the sleeve O.D.

Follow the above procedure in reverse to reassemble

the pump.

NOTE:

(1) Make sure all gaskets, o-rings and sealing sur-

faces of the check valve are in good condition

before reassembly. Replace as is necessary.

(2) Make a heavy bead of "GASKET ELIMINATOR"

Loctite #518 or equivalent all around the outer

edge, inner edge and around the mounting holes

on the wear plate (89) before reinstalling wear

plate onto the pump casing (1) for sealing.

IMPELLER NUT INSTALLATION TORQUE

Use the following impeller nut (4) torque value during

installation:

Pump Model

Nut Size

3DTH